<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>

<form action="/login" method="post">
    用户名：<input type="text" name="username_s"><br>
    密&nbsp;&nbsp;&nbsp;码: <input type="password" name="password_s"><br>
    <input type="submit" value="登录">

</form>

</body>
</html>